The signature of dark energy perturbations in galaxy cluster surveys - INSPIRE

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The signature of dark energy perturbations in galaxy cluster surveys

Feb, 2009

5 pages

Published in:

JCAP 07 (2009) 040

e-Print:

0902.3226 [astro-ph.CO]

DOI:

10.1088/1475-7516/2009/07/040

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Abstract: (arXiv)

All models of dynamical dark energy possess fluctuations, which affect the number of galaxy clusters in the Universe. We have studied the impact of dark energy clustering on the number of clusters using a generalization of the spherical collapse model and the Press-Schechter formalism. Our statistical analysis is performed in a 7-parameter space using the Fisher matrix method, for several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) surveys. In some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when its data is combined with WMAP and SDSS. Future observations could go much further and probe the nature of dark energy by distinguishing between different models on the basis of their perturbations, not only their expansion histories.

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